1 /* ssl/s3_clnt.c */
2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
3 * All rights reserved.
4 *
5 * This package is an SSL implementation written
6 * by Eric Young (eay@cryptsoft.com).
7 * The implementation was written so as to conform with Netscapes SSL.
8 *
9 * This library is free for commercial and non-commercial use as long as
10 * the following conditions are aheared to. The following conditions
11 * apply to all code found in this distribution, be it the RC4, RSA,
12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation
13 * included with this distribution is covered by the same copyright terms
14 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
15 *
16 * Copyright remains Eric Young's, and as such any Copyright notices in
17 * the code are not to be removed.
18 * If this package is used in a product, Eric Young should be given attribution
19 * as the author of the parts of the library used.
20 * This can be in the form of a textual message at program startup or
21 * in documentation (online or textual) provided with the package.
22 *
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
25 * are met:
26 * 1. Redistributions of source code must retain the copyright
27 * notice, this list of conditions and the following disclaimer.
28 * 2. Redistributions in binary form must reproduce the above copyright
29 * notice, this list of conditions and the following disclaimer in the
30 * documentation and/or other materials provided with the distribution.
31 * 3. All advertising materials mentioning features or use of this software
32 * must display the following acknowledgement:
33 * "This product includes cryptographic software written by
34 * Eric Young (eay@cryptsoft.com)"
35 * The word 'cryptographic' can be left out if the rouines from the library
36 * being used are not cryptographic related :-).
37 * 4. If you include any Windows specific code (or a derivative thereof) from
38 * the apps directory (application code) you must include an acknowledgement:
39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40 *
41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
51 * SUCH DAMAGE.
52 *
53 * The licence and distribution terms for any publically available version or
54 * derivative of this code cannot be changed. i.e. this code cannot simply be
55 * copied and put under another distribution licence
56 * [including the GNU Public Licence.]
57 */
58 /* ====================================================================
59 * Copyright (c) 1998-2003 The OpenSSL Project. All rights reserved.
60 *
61 * Redistribution and use in source and binary forms, with or without
62 * modification, are permitted provided that the following conditions
63 * are met:
64 *
65 * 1. Redistributions of source code must retain the above copyright
66 * notice, this list of conditions and the following disclaimer.
67 *
68 * 2. Redistributions in binary form must reproduce the above copyright
69 * notice, this list of conditions and the following disclaimer in
70 * the documentation and/or other materials provided with the
71 * distribution.
72 *
73 * 3. All advertising materials mentioning features or use of this
74 * software must display the following acknowledgment:
75 * "This product includes software developed by the OpenSSL Project
76 * for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
77 *
78 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
79 * endorse or promote products derived from this software without
80 * prior written permission. For written permission, please contact
81 * openssl-core@openssl.org.
82 *
83 * 5. Products derived from this software may not be called "OpenSSL"
84 * nor may "OpenSSL" appear in their names without prior written
85 * permission of the OpenSSL Project.
86 *
87 * 6. Redistributions of any form whatsoever must retain the following
88 * acknowledgment:
89 * "This product includes software developed by the OpenSSL Project
90 * for use in the OpenSSL Toolkit (http://www.openssl.org/)"
91 *
92 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
93 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
94 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
95 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
96 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
97 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
98 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
99 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
100 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
101 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
102 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
103 * OF THE POSSIBILITY OF SUCH DAMAGE.
104 * ====================================================================
105 *
106 * This product includes cryptographic software written by Eric Young
107 * (eay@cryptsoft.com). This product includes software written by Tim
108 * Hudson (tjh@cryptsoft.com).
109 *
110 */
111 /* ====================================================================
112 * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
113 *
114 * Portions of the attached software ("Contribution") are developed by
115 * SUN MICROSYSTEMS, INC., and are contributed to the OpenSSL project.
116 *
117 * The Contribution is licensed pursuant to the OpenSSL open source
118 * license provided above.
119 *
120 * ECC cipher suite support in OpenSSL originally written by
121 * Vipul Gupta and Sumit Gupta of Sun Microsystems Laboratories.
122 *
123 */
124
125 #include <stdio.h>
126 #include "ssl_locl.h"
127 #include "kssl_lcl.h"
128 #include <openssl/buffer.h>
129 #include <openssl/rand.h>
130 #include <openssl/objects.h>
131 #include <openssl/evp.h>
132 #include <openssl/md5.h>
133 #ifdef OPENSSL_FIPS
134 # include <openssl/fips.h>
135 #endif
136
137 #ifndef OPENSSL_NO_DH
138 # include <openssl/dh.h>
139 #endif
140 #include <openssl/bn.h>
141 #ifndef OPENSSL_NO_ENGINE
142 # include <openssl/engine.h>
143 #endif
144
145 static SSL_METHOD *ssl3_get_client_method(int ver);
146 static int ca_dn_cmp(const X509_NAME *const *a, const X509_NAME *const *b);
147
148 #ifndef OPENSSL_NO_ECDH
149 static int curve_id2nid(int curve_id);
150 int check_srvr_ecc_cert_and_alg(X509 *x, SSL_CIPHER *cs);
151 #endif
152
ssl3_get_client_method(int ver)153 static SSL_METHOD *ssl3_get_client_method(int ver)
154 {
155 if (ver == SSL3_VERSION)
156 return (SSLv3_client_method());
157 else
158 return (NULL);
159 }
160
IMPLEMENT_ssl3_meth_func(SSLv3_client_method,ssl_undefined_function,ssl3_connect,ssl3_get_client_method)161 IMPLEMENT_ssl3_meth_func(SSLv3_client_method,
162 ssl_undefined_function,
163 ssl3_connect, ssl3_get_client_method)
164
165 int ssl3_connect(SSL *s)
166 {
167 BUF_MEM *buf = NULL;
168 unsigned long Time = (unsigned long)time(NULL);
169 void (*cb) (const SSL *ssl, int type, int val) = NULL;
170 int ret = -1;
171 int new_state, state, skip = 0;
172
173 RAND_add(&Time, sizeof(Time), 0);
174 ERR_clear_error();
175 clear_sys_error();
176
177 if (s->info_callback != NULL)
178 cb = s->info_callback;
179 else if (s->ctx->info_callback != NULL)
180 cb = s->ctx->info_callback;
181
182 s->in_handshake++;
183 if (!SSL_in_init(s) || SSL_in_before(s))
184 SSL_clear(s);
185
186 for (;;) {
187 state = s->state;
188
189 switch (s->state) {
190 case SSL_ST_RENEGOTIATE:
191 s->new_session = 1;
192 s->state = SSL_ST_CONNECT;
193 s->ctx->stats.sess_connect_renegotiate++;
194 /* break */
195 case SSL_ST_BEFORE:
196 case SSL_ST_CONNECT:
197 case SSL_ST_BEFORE | SSL_ST_CONNECT:
198 case SSL_ST_OK | SSL_ST_CONNECT:
199
200 s->server = 0;
201 if (cb != NULL)
202 cb(s, SSL_CB_HANDSHAKE_START, 1);
203
204 if ((s->version & 0xff00) != 0x0300) {
205 SSLerr(SSL_F_SSL3_CONNECT, ERR_R_INTERNAL_ERROR);
206 ret = -1;
207 goto end;
208 }
209
210 /* s->version=SSL3_VERSION; */
211 s->type = SSL_ST_CONNECT;
212
213 if (s->init_buf == NULL) {
214 if ((buf = BUF_MEM_new()) == NULL) {
215 ret = -1;
216 goto end;
217 }
218 if (!BUF_MEM_grow(buf, SSL3_RT_MAX_PLAIN_LENGTH)) {
219 ret = -1;
220 goto end;
221 }
222 s->init_buf = buf;
223 buf = NULL;
224 }
225
226 if (!ssl3_setup_buffers(s)) {
227 ret = -1;
228 goto end;
229 }
230
231 /* setup buffing BIO */
232 if (!ssl_init_wbio_buffer(s, 0)) {
233 ret = -1;
234 goto end;
235 }
236
237 /* don't push the buffering BIO quite yet */
238
239 ssl3_init_finished_mac(s);
240
241 s->state = SSL3_ST_CW_CLNT_HELLO_A;
242 s->ctx->stats.sess_connect++;
243 s->init_num = 0;
244 break;
245
246 case SSL3_ST_CW_CLNT_HELLO_A:
247 case SSL3_ST_CW_CLNT_HELLO_B:
248
249 s->shutdown = 0;
250 ret = ssl3_client_hello(s);
251 if (ret <= 0)
252 goto end;
253 s->state = SSL3_ST_CR_SRVR_HELLO_A;
254 s->init_num = 0;
255
256 /* turn on buffering for the next lot of output */
257 if (s->bbio != s->wbio)
258 s->wbio = BIO_push(s->bbio, s->wbio);
259
260 break;
261
262 case SSL3_ST_CR_SRVR_HELLO_A:
263 case SSL3_ST_CR_SRVR_HELLO_B:
264 ret = ssl3_get_server_hello(s);
265 if (ret <= 0)
266 goto end;
267 if (s->hit) {
268 s->state = SSL3_ST_CR_FINISHED_A;
269 #ifndef OPENSSL_NO_TLSEXT
270 if (s->tlsext_ticket_expected) {
271 /* receive renewed session ticket */
272 s->state = SSL3_ST_CR_SESSION_TICKET_A;
273 }
274 #endif
275 } else
276 s->state = SSL3_ST_CR_CERT_A;
277 s->init_num = 0;
278 break;
279
280 case SSL3_ST_CR_CERT_A:
281 case SSL3_ST_CR_CERT_B:
282 #ifndef OPENSSL_NO_TLSEXT
283 ret = ssl3_check_finished(s);
284 if (ret <= 0)
285 goto end;
286 if (ret == 2) {
287 s->hit = 1;
288 if (s->tlsext_ticket_expected)
289 s->state = SSL3_ST_CR_SESSION_TICKET_A;
290 else
291 s->state = SSL3_ST_CR_FINISHED_A;
292 s->init_num = 0;
293 break;
294 }
295 #endif
296 /* Check if it is anon DH/ECDH */
297 if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL)) {
298 ret = ssl3_get_server_certificate(s);
299 if (ret <= 0)
300 goto end;
301 #ifndef OPENSSL_NO_TLSEXT
302 if (s->tlsext_status_expected)
303 s->state = SSL3_ST_CR_CERT_STATUS_A;
304 else
305 s->state = SSL3_ST_CR_KEY_EXCH_A;
306 } else {
307 skip = 1;
308 s->state = SSL3_ST_CR_KEY_EXCH_A;
309 }
310 #else
311 } else
312 skip = 1;
313
314 s->state = SSL3_ST_CR_KEY_EXCH_A;
315 #endif
316 s->init_num = 0;
317 break;
318
319 case SSL3_ST_CR_KEY_EXCH_A:
320 case SSL3_ST_CR_KEY_EXCH_B:
321 ret = ssl3_get_key_exchange(s);
322 if (ret <= 0)
323 goto end;
324 s->state = SSL3_ST_CR_CERT_REQ_A;
325 s->init_num = 0;
326
327 /*
328 * at this point we check that we have the required stuff from
329 * the server
330 */
331 if (!ssl3_check_cert_and_algorithm(s)) {
332 ret = -1;
333 goto end;
334 }
335 break;
336
337 case SSL3_ST_CR_CERT_REQ_A:
338 case SSL3_ST_CR_CERT_REQ_B:
339 ret = ssl3_get_certificate_request(s);
340 if (ret <= 0)
341 goto end;
342 s->state = SSL3_ST_CR_SRVR_DONE_A;
343 s->init_num = 0;
344 break;
345
346 case SSL3_ST_CR_SRVR_DONE_A:
347 case SSL3_ST_CR_SRVR_DONE_B:
348 ret = ssl3_get_server_done(s);
349 if (ret <= 0)
350 goto end;
351 if (s->s3->tmp.cert_req)
352 s->state = SSL3_ST_CW_CERT_A;
353 else
354 s->state = SSL3_ST_CW_KEY_EXCH_A;
355 s->init_num = 0;
356
357 break;
358
359 case SSL3_ST_CW_CERT_A:
360 case SSL3_ST_CW_CERT_B:
361 case SSL3_ST_CW_CERT_C:
362 case SSL3_ST_CW_CERT_D:
363 ret = ssl3_send_client_certificate(s);
364 if (ret <= 0)
365 goto end;
366 s->state = SSL3_ST_CW_KEY_EXCH_A;
367 s->init_num = 0;
368 break;
369
370 case SSL3_ST_CW_KEY_EXCH_A:
371 case SSL3_ST_CW_KEY_EXCH_B:
372 ret = ssl3_send_client_key_exchange(s);
373 if (ret <= 0)
374 goto end;
375 /*
376 * EAY EAY EAY need to check for DH fix cert sent back
377 */
378 /*
379 * For TLS, cert_req is set to 2, so a cert chain of nothing is
380 * sent, but no verify packet is sent
381 */
382 /*
383 * XXX: For now, we do not support client authentication in ECDH
384 * cipher suites with ECDH (rather than ECDSA) certificates. We
385 * need to skip the certificate verify message when client's
386 * ECDH public key is sent inside the client certificate.
387 */
388 if (s->s3->tmp.cert_req == 1) {
389 s->state = SSL3_ST_CW_CERT_VRFY_A;
390 } else {
391 s->state = SSL3_ST_CW_CHANGE_A;
392 s->s3->change_cipher_spec = 0;
393 }
394
395 s->init_num = 0;
396 break;
397
398 case SSL3_ST_CW_CERT_VRFY_A:
399 case SSL3_ST_CW_CERT_VRFY_B:
400 ret = ssl3_send_client_verify(s);
401 if (ret <= 0)
402 goto end;
403 s->state = SSL3_ST_CW_CHANGE_A;
404 s->init_num = 0;
405 s->s3->change_cipher_spec = 0;
406 break;
407
408 case SSL3_ST_CW_CHANGE_A:
409 case SSL3_ST_CW_CHANGE_B:
410 ret = ssl3_send_change_cipher_spec(s,
411 SSL3_ST_CW_CHANGE_A,
412 SSL3_ST_CW_CHANGE_B);
413 if (ret <= 0)
414 goto end;
415 s->state = SSL3_ST_CW_FINISHED_A;
416 s->init_num = 0;
417
418 s->session->cipher = s->s3->tmp.new_cipher;
419 #ifdef OPENSSL_NO_COMP
420 s->session->compress_meth = 0;
421 #else
422 if (s->s3->tmp.new_compression == NULL)
423 s->session->compress_meth = 0;
424 else
425 s->session->compress_meth = s->s3->tmp.new_compression->id;
426 #endif
427 if (!s->method->ssl3_enc->setup_key_block(s)) {
428 ret = -1;
429 goto end;
430 }
431
432 if (!s->method->ssl3_enc->change_cipher_state(s,
433 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
434 {
435 ret = -1;
436 goto end;
437 }
438
439 break;
440
441 case SSL3_ST_CW_FINISHED_A:
442 case SSL3_ST_CW_FINISHED_B:
443 ret = ssl3_send_finished(s,
444 SSL3_ST_CW_FINISHED_A,
445 SSL3_ST_CW_FINISHED_B,
446 s->method->
447 ssl3_enc->client_finished_label,
448 s->method->
449 ssl3_enc->client_finished_label_len);
450 if (ret <= 0)
451 goto end;
452 s->s3->flags |= SSL3_FLAGS_CCS_OK;
453 s->state = SSL3_ST_CW_FLUSH;
454
455 /* clear flags */
456 s->s3->flags &= ~SSL3_FLAGS_POP_BUFFER;
457 if (s->hit) {
458 s->s3->tmp.next_state = SSL_ST_OK;
459 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED) {
460 s->state = SSL_ST_OK;
461 s->s3->flags |= SSL3_FLAGS_POP_BUFFER;
462 s->s3->delay_buf_pop_ret = 0;
463 }
464 } else {
465 #ifndef OPENSSL_NO_TLSEXT
466 /*
467 * Allow NewSessionTicket if ticket expected
468 */
469 if (s->tlsext_ticket_expected)
470 s->s3->tmp.next_state = SSL3_ST_CR_SESSION_TICKET_A;
471 else
472 #endif
473
474 s->s3->tmp.next_state = SSL3_ST_CR_FINISHED_A;
475 }
476 s->init_num = 0;
477 break;
478
479 #ifndef OPENSSL_NO_TLSEXT
480 case SSL3_ST_CR_SESSION_TICKET_A:
481 case SSL3_ST_CR_SESSION_TICKET_B:
482 ret = ssl3_get_new_session_ticket(s);
483 if (ret <= 0)
484 goto end;
485 s->state = SSL3_ST_CR_FINISHED_A;
486 s->init_num = 0;
487 break;
488
489 case SSL3_ST_CR_CERT_STATUS_A:
490 case SSL3_ST_CR_CERT_STATUS_B:
491 ret = ssl3_get_cert_status(s);
492 if (ret <= 0)
493 goto end;
494 s->state = SSL3_ST_CR_KEY_EXCH_A;
495 s->init_num = 0;
496 break;
497 #endif
498
499 case SSL3_ST_CR_FINISHED_A:
500 case SSL3_ST_CR_FINISHED_B:
501
502 s->s3->flags |= SSL3_FLAGS_CCS_OK;
503 ret = ssl3_get_finished(s, SSL3_ST_CR_FINISHED_A,
504 SSL3_ST_CR_FINISHED_B);
505 if (ret <= 0)
506 goto end;
507
508 if (s->hit)
509 s->state = SSL3_ST_CW_CHANGE_A;
510 else
511 s->state = SSL_ST_OK;
512 s->init_num = 0;
513 break;
514
515 case SSL3_ST_CW_FLUSH:
516 s->rwstate = SSL_WRITING;
517 if (BIO_flush(s->wbio) <= 0) {
518 ret = -1;
519 goto end;
520 }
521 s->rwstate = SSL_NOTHING;
522 s->state = s->s3->tmp.next_state;
523 break;
524
525 case SSL_ST_OK:
526 /* clean a few things up */
527 ssl3_cleanup_key_block(s);
528
529 if (s->init_buf != NULL) {
530 BUF_MEM_free(s->init_buf);
531 s->init_buf = NULL;
532 }
533
534 /*
535 * If we are not 'joining' the last two packets, remove the
536 * buffering now
537 */
538 if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
539 ssl_free_wbio_buffer(s);
540 /* else do it later in ssl3_write */
541
542 s->init_num = 0;
543 s->new_session = 0;
544
545 ssl_update_cache(s, SSL_SESS_CACHE_CLIENT);
546 if (s->hit)
547 s->ctx->stats.sess_hit++;
548
549 ret = 1;
550 /* s->server=0; */
551 s->handshake_func = ssl3_connect;
552 s->ctx->stats.sess_connect_good++;
553
554 if (cb != NULL)
555 cb(s, SSL_CB_HANDSHAKE_DONE, 1);
556
557 goto end;
558 /* break; */
559
560 default:
561 SSLerr(SSL_F_SSL3_CONNECT, SSL_R_UNKNOWN_STATE);
562 ret = -1;
563 goto end;
564 /* break; */
565 }
566
567 /* did we do anything */
568 if (!s->s3->tmp.reuse_message && !skip) {
569 if (s->debug) {
570 if ((ret = BIO_flush(s->wbio)) <= 0)
571 goto end;
572 }
573
574 if ((cb != NULL) && (s->state != state)) {
575 new_state = s->state;
576 s->state = state;
577 cb(s, SSL_CB_CONNECT_LOOP, 1);
578 s->state = new_state;
579 }
580 }
581 skip = 0;
582 }
583 end:
584 s->in_handshake--;
585 if (buf != NULL)
586 BUF_MEM_free(buf);
587 if (cb != NULL)
588 cb(s, SSL_CB_CONNECT_EXIT, ret);
589 return (ret);
590 }
591
ssl3_client_hello(SSL * s)592 int ssl3_client_hello(SSL *s)
593 {
594 unsigned char *buf;
595 unsigned char *p, *d;
596 int i;
597 unsigned long Time, l;
598 #ifndef OPENSSL_NO_COMP
599 int j;
600 SSL_COMP *comp;
601 #endif
602
603 buf = (unsigned char *)s->init_buf->data;
604 if (s->state == SSL3_ST_CW_CLNT_HELLO_A) {
605 SSL_SESSION *sess = s->session;
606 if ((sess == NULL) || (sess->ssl_version != s->version) ||
607 #ifdef OPENSSL_NO_TLSEXT
608 !sess->session_id_length ||
609 #else
610 (!sess->session_id_length && !sess->tlsext_tick) ||
611 #endif
612 (sess->not_resumable)) {
613 if (!ssl_get_new_session(s, 0))
614 goto err;
615 }
616 /* else use the pre-loaded session */
617
618 p = s->s3->client_random;
619 Time = (unsigned long)time(NULL); /* Time */
620 l2n(Time, p);
621 if (RAND_pseudo_bytes(p, SSL3_RANDOM_SIZE - 4) <= 0)
622 goto err;
623
624 /* Do the message type and length last */
625 d = p = &(buf[4]);
626
627 *(p++) = s->version >> 8;
628 *(p++) = s->version & 0xff;
629 s->client_version = s->version;
630
631 /* Random stuff */
632 memcpy(p, s->s3->client_random, SSL3_RANDOM_SIZE);
633 p += SSL3_RANDOM_SIZE;
634
635 /* Session ID */
636 if (s->new_session)
637 i = 0;
638 else
639 i = s->session->session_id_length;
640 *(p++) = i;
641 if (i != 0) {
642 if (i > (int)sizeof(s->session->session_id)) {
643 SSLerr(SSL_F_SSL3_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
644 goto err;
645 }
646 memcpy(p, s->session->session_id, i);
647 p += i;
648 }
649
650 /* Ciphers supported */
651 i = ssl_cipher_list_to_bytes(s, SSL_get_ciphers(s), &(p[2]), 0);
652 if (i == 0) {
653 SSLerr(SSL_F_SSL3_CLIENT_HELLO, SSL_R_NO_CIPHERS_AVAILABLE);
654 goto err;
655 }
656 s2n(i, p);
657 p += i;
658
659 /* COMPRESSION */
660 #ifdef OPENSSL_NO_COMP
661 *(p++) = 1;
662 #else
663 if (s->ctx->comp_methods == NULL)
664 j = 0;
665 else
666 j = sk_SSL_COMP_num(s->ctx->comp_methods);
667 *(p++) = 1 + j;
668 for (i = 0; i < j; i++) {
669 comp = sk_SSL_COMP_value(s->ctx->comp_methods, i);
670 *(p++) = comp->id;
671 }
672 #endif
673 *(p++) = 0; /* Add the NULL method */
674 #ifndef OPENSSL_NO_TLSEXT
675 if ((p =
676 ssl_add_clienthello_tlsext(s, p,
677 buf + SSL3_RT_MAX_PLAIN_LENGTH)) ==
678 NULL) {
679 SSLerr(SSL_F_SSL3_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
680 goto err;
681 }
682 #endif
683 l = (p - d);
684 d = buf;
685 *(d++) = SSL3_MT_CLIENT_HELLO;
686 l2n3(l, d);
687
688 s->state = SSL3_ST_CW_CLNT_HELLO_B;
689 /* number of bytes to write */
690 s->init_num = p - buf;
691 s->init_off = 0;
692 }
693
694 /* SSL3_ST_CW_CLNT_HELLO_B */
695 return (ssl3_do_write(s, SSL3_RT_HANDSHAKE));
696 err:
697 return (-1);
698 }
699
ssl3_get_server_hello(SSL * s)700 int ssl3_get_server_hello(SSL *s)
701 {
702 STACK_OF(SSL_CIPHER) *sk;
703 SSL_CIPHER *c;
704 unsigned char *p, *d;
705 int i, al, ok;
706 unsigned int j;
707 long n;
708 #ifndef OPENSSL_NO_COMP
709 SSL_COMP *comp;
710 #endif
711
712 n = s->method->ssl_get_message(s,
713 SSL3_ST_CR_SRVR_HELLO_A,
714 SSL3_ST_CR_SRVR_HELLO_B, -1, 20000, &ok);
715
716 if (!ok)
717 return ((int)n);
718
719 if (SSL_version(s) == DTLS1_VERSION || SSL_version(s) == DTLS1_BAD_VER) {
720 if (s->s3->tmp.message_type == DTLS1_MT_HELLO_VERIFY_REQUEST) {
721 if (s->d1->send_cookie == 0) {
722 s->s3->tmp.reuse_message = 1;
723 return 1;
724 } else { /* already sent a cookie */
725
726 al = SSL_AD_UNEXPECTED_MESSAGE;
727 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_BAD_MESSAGE_TYPE);
728 goto f_err;
729 }
730 }
731 }
732
733 if (s->s3->tmp.message_type != SSL3_MT_SERVER_HELLO) {
734 al = SSL_AD_UNEXPECTED_MESSAGE;
735 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_BAD_MESSAGE_TYPE);
736 goto f_err;
737 }
738
739 d = p = (unsigned char *)s->init_msg;
740
741 if ((p[0] != (s->version >> 8)) || (p[1] != (s->version & 0xff))) {
742 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_WRONG_SSL_VERSION);
743 s->version = (s->version & 0xff00) | p[1];
744 al = SSL_AD_PROTOCOL_VERSION;
745 goto f_err;
746 }
747 p += 2;
748
749 /* load the server hello data */
750 /* load the server random */
751 memcpy(s->s3->server_random, p, SSL3_RANDOM_SIZE);
752 p += SSL3_RANDOM_SIZE;
753
754 /* get the session-id */
755 j = *(p++);
756
757 if ((j > sizeof s->session->session_id) || (j > SSL3_SESSION_ID_SIZE)) {
758 al = SSL_AD_ILLEGAL_PARAMETER;
759 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_SSL3_SESSION_ID_TOO_LONG);
760 goto f_err;
761 }
762
763 if (j != 0 && j == s->session->session_id_length
764 && memcmp(p, s->session->session_id, j) == 0) {
765 if (s->sid_ctx_length != s->session->sid_ctx_length
766 || memcmp(s->session->sid_ctx, s->sid_ctx, s->sid_ctx_length)) {
767 /* actually a client application bug */
768 al = SSL_AD_ILLEGAL_PARAMETER;
769 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,
770 SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT);
771 goto f_err;
772 }
773 s->s3->flags |= SSL3_FLAGS_CCS_OK;
774 s->hit = 1;
775 } else { /* a miss or crap from the other end */
776
777 /*
778 * If we were trying for session-id reuse, make a new SSL_SESSION so
779 * we don't stuff up other people
780 */
781 s->hit = 0;
782 if (s->session->session_id_length > 0) {
783 if (!ssl_get_new_session(s, 0)) {
784 al = SSL_AD_INTERNAL_ERROR;
785 goto f_err;
786 }
787 }
788 s->session->session_id_length = j;
789 memcpy(s->session->session_id, p, j); /* j could be 0 */
790 }
791 p += j;
792 c = ssl_get_cipher_by_char(s, p);
793 if (c == NULL) {
794 /* unknown cipher */
795 al = SSL_AD_ILLEGAL_PARAMETER;
796 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_UNKNOWN_CIPHER_RETURNED);
797 goto f_err;
798 }
799 p += ssl_put_cipher_by_char(s, NULL, NULL);
800
801 sk = ssl_get_ciphers_by_id(s);
802 i = sk_SSL_CIPHER_find(sk, c);
803 if (i < 0) {
804 /* we did not say we would use this cipher */
805 al = SSL_AD_ILLEGAL_PARAMETER;
806 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_WRONG_CIPHER_RETURNED);
807 goto f_err;
808 }
809
810 /*
811 * Depending on the session caching (internal/external), the cipher
812 * and/or cipher_id values may not be set. Make sure that cipher_id is
813 * set and use it for comparison.
814 */
815 if (s->session->cipher)
816 s->session->cipher_id = s->session->cipher->id;
817 if (s->hit && (s->session->cipher_id != c->id)) {
818 /* Workaround is now obsolete */
819 #if 0
820 if (!(s->options & SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG))
821 #endif
822 {
823 al = SSL_AD_ILLEGAL_PARAMETER;
824 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,
825 SSL_R_OLD_SESSION_CIPHER_NOT_RETURNED);
826 goto f_err;
827 }
828 }
829 s->s3->tmp.new_cipher = c;
830
831 /* lets get the compression algorithm */
832 /* COMPRESSION */
833 #ifdef OPENSSL_NO_COMP
834 if (*(p++) != 0) {
835 al = SSL_AD_ILLEGAL_PARAMETER;
836 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,
837 SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
838 goto f_err;
839 }
840 #else
841 j = *(p++);
842 if (j == 0)
843 comp = NULL;
844 else
845 comp = ssl3_comp_find(s->ctx->comp_methods, j);
846
847 if ((j != 0) && (comp == NULL)) {
848 al = SSL_AD_ILLEGAL_PARAMETER;
849 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,
850 SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
851 goto f_err;
852 } else {
853 s->s3->tmp.new_compression = comp;
854 }
855 #endif
856 #ifndef OPENSSL_NO_TLSEXT
857 /* TLS extensions */
858 if (s->version >= SSL3_VERSION) {
859 if (!ssl_parse_serverhello_tlsext(s, &p, d, n, &al)) {
860 /* 'al' set by ssl_parse_serverhello_tlsext */
861 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_PARSE_TLSEXT);
862 goto f_err;
863 }
864 if (ssl_check_serverhello_tlsext(s) <= 0) {
865 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_SERVERHELLO_TLSEXT);
866 goto err;
867 }
868 }
869 #endif
870
871 if (p != (d + n)) {
872 /* wrong packet length */
873 al = SSL_AD_DECODE_ERROR;
874 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_BAD_PACKET_LENGTH);
875 goto f_err;
876 }
877
878 return (1);
879 f_err:
880 ssl3_send_alert(s, SSL3_AL_FATAL, al);
881 #ifndef OPENSSL_NO_TLSEXT
882 err:
883 #endif
884 return (-1);
885 }
886
ssl3_get_server_certificate(SSL * s)887 int ssl3_get_server_certificate(SSL *s)
888 {
889 int al, i, ok, ret = -1;
890 unsigned long n, nc, llen, l;
891 X509 *x = NULL;
892 const unsigned char *q, *p;
893 unsigned char *d;
894 STACK_OF(X509) *sk = NULL;
895 SESS_CERT *sc;
896 EVP_PKEY *pkey = NULL;
897 int need_cert = 1; /* VRS: 0=> will allow null cert if auth ==
898 * KRB5 */
899
900 n = s->method->ssl_get_message(s,
901 SSL3_ST_CR_CERT_A,
902 SSL3_ST_CR_CERT_B,
903 -1, s->max_cert_list, &ok);
904
905 if (!ok)
906 return ((int)n);
907
908 if ((s->s3->tmp.message_type == SSL3_MT_SERVER_KEY_EXCHANGE) ||
909 ((s->s3->tmp.new_cipher->algorithms & SSL_aKRB5) &&
910 (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE))) {
911 s->s3->tmp.reuse_message = 1;
912 return (1);
913 }
914
915 if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE) {
916 al = SSL_AD_UNEXPECTED_MESSAGE;
917 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE, SSL_R_BAD_MESSAGE_TYPE);
918 goto f_err;
919 }
920 p = d = (unsigned char *)s->init_msg;
921
922 if ((sk = sk_X509_new_null()) == NULL) {
923 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE, ERR_R_MALLOC_FAILURE);
924 goto err;
925 }
926
927 n2l3(p, llen);
928 if (llen + 3 != n) {
929 al = SSL_AD_DECODE_ERROR;
930 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE, SSL_R_LENGTH_MISMATCH);
931 goto f_err;
932 }
933 for (nc = 0; nc < llen;) {
934 if (nc + 3 > llen) {
935 al = SSL_AD_DECODE_ERROR;
936 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
937 SSL_R_CERT_LENGTH_MISMATCH);
938 goto f_err;
939 }
940 n2l3(p, l);
941 if ((l + nc + 3) > llen) {
942 al = SSL_AD_DECODE_ERROR;
943 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
944 SSL_R_CERT_LENGTH_MISMATCH);
945 goto f_err;
946 }
947
948 q = p;
949 x = d2i_X509(NULL, &q, l);
950 if (x == NULL) {
951 al = SSL_AD_BAD_CERTIFICATE;
952 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE, ERR_R_ASN1_LIB);
953 goto f_err;
954 }
955 if (q != (p + l)) {
956 al = SSL_AD_DECODE_ERROR;
957 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
958 SSL_R_CERT_LENGTH_MISMATCH);
959 goto f_err;
960 }
961 if (!sk_X509_push(sk, x)) {
962 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE, ERR_R_MALLOC_FAILURE);
963 goto err;
964 }
965 x = NULL;
966 nc += l + 3;
967 p = q;
968 }
969
970 i = ssl_verify_cert_chain(s, sk);
971 if ((s->verify_mode != SSL_VERIFY_NONE) && (i <= 0)
972 #ifndef OPENSSL_NO_KRB5
973 && (s->s3->tmp.
974 new_cipher->algorithms & (SSL_MKEY_MASK | SSL_AUTH_MASK))
975 != (SSL_aKRB5 | SSL_kKRB5)
976 #endif /* OPENSSL_NO_KRB5 */
977 ) {
978 al = ssl_verify_alarm_type(s->verify_result);
979 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
980 SSL_R_CERTIFICATE_VERIFY_FAILED);
981 goto f_err;
982 }
983 ERR_clear_error(); /* but we keep s->verify_result */
984
985 sc = ssl_sess_cert_new();
986 if (sc == NULL)
987 goto err;
988
989 if (s->session->sess_cert)
990 ssl_sess_cert_free(s->session->sess_cert);
991 s->session->sess_cert = sc;
992
993 sc->cert_chain = sk;
994 /*
995 * Inconsistency alert: cert_chain does include the peer's certificate,
996 * which we don't include in s3_srvr.c
997 */
998 x = sk_X509_value(sk, 0);
999 sk = NULL;
1000 /*
1001 * VRS 19990621: possible memory leak; sk=null ==> !sk_pop_free() @end
1002 */
1003
1004 pkey = X509_get_pubkey(x);
1005
1006 /* VRS: allow null cert if auth == KRB5 */
1007 need_cert = ((s->s3->tmp.new_cipher->algorithms
1008 & (SSL_MKEY_MASK | SSL_AUTH_MASK))
1009 == (SSL_aKRB5 | SSL_kKRB5)) ? 0 : 1;
1010
1011 #ifdef KSSL_DEBUG
1012 printf("pkey,x = %p, %p\n", (void *)pkey, (void *)x);
1013 printf("ssl_cert_type(x,pkey) = %d\n", ssl_cert_type(x, pkey));
1014 printf("cipher, alg, nc = %s, %lx, %d\n", s->s3->tmp.new_cipher->name,
1015 s->s3->tmp.new_cipher->algorithms, need_cert);
1016 #endif /* KSSL_DEBUG */
1017
1018 if (need_cert && ((pkey == NULL) || EVP_PKEY_missing_parameters(pkey))) {
1019 x = NULL;
1020 al = SSL3_AL_FATAL;
1021 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1022 SSL_R_UNABLE_TO_FIND_PUBLIC_KEY_PARAMETERS);
1023 goto f_err;
1024 }
1025
1026 i = ssl_cert_type(x, pkey);
1027 if (need_cert && i < 0) {
1028 x = NULL;
1029 al = SSL3_AL_FATAL;
1030 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1031 SSL_R_UNKNOWN_CERTIFICATE_TYPE);
1032 goto f_err;
1033 }
1034
1035 if (need_cert) {
1036 sc->peer_cert_type = i;
1037 CRYPTO_add(&x->references, 1, CRYPTO_LOCK_X509);
1038 /*
1039 * Why would the following ever happen? We just created sc a couple
1040 * of lines ago.
1041 */
1042 if (sc->peer_pkeys[i].x509 != NULL)
1043 X509_free(sc->peer_pkeys[i].x509);
1044 sc->peer_pkeys[i].x509 = x;
1045 sc->peer_key = &(sc->peer_pkeys[i]);
1046
1047 if (s->session->peer != NULL)
1048 X509_free(s->session->peer);
1049 CRYPTO_add(&x->references, 1, CRYPTO_LOCK_X509);
1050 s->session->peer = x;
1051 } else {
1052 sc->peer_cert_type = i;
1053 sc->peer_key = NULL;
1054
1055 if (s->session->peer != NULL)
1056 X509_free(s->session->peer);
1057 s->session->peer = NULL;
1058 }
1059 s->session->verify_result = s->verify_result;
1060
1061 x = NULL;
1062 ret = 1;
1063
1064 if (0) {
1065 f_err:
1066 ssl3_send_alert(s, SSL3_AL_FATAL, al);
1067 }
1068 err:
1069 EVP_PKEY_free(pkey);
1070 X509_free(x);
1071 sk_X509_pop_free(sk, X509_free);
1072 return (ret);
1073 }
1074
ssl3_get_key_exchange(SSL * s)1075 int ssl3_get_key_exchange(SSL *s)
1076 {
1077 #ifndef OPENSSL_NO_RSA
1078 unsigned char *q, md_buf[EVP_MAX_MD_SIZE * 2];
1079 #endif
1080 EVP_MD_CTX md_ctx;
1081 unsigned char *param, *p;
1082 int al, j, ok;
1083 long i, param_len, n, alg;
1084 EVP_PKEY *pkey = NULL;
1085 #ifndef OPENSSL_NO_RSA
1086 RSA *rsa = NULL;
1087 #endif
1088 #ifndef OPENSSL_NO_DH
1089 DH *dh = NULL;
1090 #endif
1091 #ifndef OPENSSL_NO_ECDH
1092 EC_KEY *ecdh = NULL;
1093 BN_CTX *bn_ctx = NULL;
1094 EC_POINT *srvr_ecpoint = NULL;
1095 int curve_nid = 0;
1096 int encoded_pt_len = 0;
1097 #endif
1098
1099 /*
1100 * use same message size as in ssl3_get_certificate_request() as
1101 * ServerKeyExchange message may be skipped
1102 */
1103 n = s->method->ssl_get_message(s,
1104 SSL3_ST_CR_KEY_EXCH_A,
1105 SSL3_ST_CR_KEY_EXCH_B,
1106 -1, s->max_cert_list, &ok);
1107
1108 if (!ok)
1109 return ((int)n);
1110
1111 alg = s->s3->tmp.new_cipher->algorithms;
1112 EVP_MD_CTX_init(&md_ctx);
1113
1114 if (s->s3->tmp.message_type != SSL3_MT_SERVER_KEY_EXCHANGE) {
1115 /*
1116 * Can't skip server key exchange if this is an ephemeral
1117 * ciphersuite.
1118 */
1119 if (alg & (SSL_kEDH | SSL_kECDHE)) {
1120 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_UNEXPECTED_MESSAGE);
1121 al = SSL_AD_UNEXPECTED_MESSAGE;
1122 goto f_err;
1123 }
1124 s->s3->tmp.reuse_message = 1;
1125 return (1);
1126 }
1127
1128 param = p = (unsigned char *)s->init_msg;
1129
1130 if (s->session->sess_cert != NULL) {
1131 #ifndef OPENSSL_NO_RSA
1132 if (s->session->sess_cert->peer_rsa_tmp != NULL) {
1133 RSA_free(s->session->sess_cert->peer_rsa_tmp);
1134 s->session->sess_cert->peer_rsa_tmp = NULL;
1135 }
1136 #endif
1137 #ifndef OPENSSL_NO_DH
1138 if (s->session->sess_cert->peer_dh_tmp) {
1139 DH_free(s->session->sess_cert->peer_dh_tmp);
1140 s->session->sess_cert->peer_dh_tmp = NULL;
1141 }
1142 #endif
1143 #ifndef OPENSSL_NO_ECDH
1144 if (s->session->sess_cert->peer_ecdh_tmp) {
1145 EC_KEY_free(s->session->sess_cert->peer_ecdh_tmp);
1146 s->session->sess_cert->peer_ecdh_tmp = NULL;
1147 }
1148 #endif
1149 } else {
1150 s->session->sess_cert = ssl_sess_cert_new();
1151 }
1152
1153 /* Total length of the parameters including the length prefix */
1154 param_len = 0;
1155
1156 al = SSL_AD_DECODE_ERROR;
1157 #ifndef OPENSSL_NO_RSA
1158 if (alg & SSL_kRSA) {
1159 /* Temporary RSA keys only allowed in export ciphersuites */
1160 if (!SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)) {
1161 al = SSL_AD_UNEXPECTED_MESSAGE;
1162 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_UNEXPECTED_MESSAGE);
1163 goto f_err;
1164 }
1165 if ((rsa = RSA_new()) == NULL) {
1166 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE);
1167 goto err;
1168 }
1169
1170 param_len = 2;
1171 if (param_len > n) {
1172 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT);
1173 goto f_err;
1174 }
1175 n2s(p, i);
1176
1177 if (i > n - param_len) {
1178 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_RSA_MODULUS_LENGTH);
1179 goto f_err;
1180 }
1181 param_len += i;
1182
1183 if (!(rsa->n = BN_bin2bn(p, i, rsa->n))) {
1184 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_BN_LIB);
1185 goto err;
1186 }
1187 p += i;
1188
1189 if (2 > n - param_len) {
1190 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT);
1191 goto f_err;
1192 }
1193 param_len += 2;
1194
1195 n2s(p, i);
1196
1197 if (i > n - param_len) {
1198 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_RSA_E_LENGTH);
1199 goto f_err;
1200 }
1201 param_len += i;
1202
1203 if (!(rsa->e = BN_bin2bn(p, i, rsa->e))) {
1204 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_BN_LIB);
1205 goto err;
1206 }
1207 p += i;
1208 n -= param_len;
1209
1210 /* this should be because we are using an export cipher */
1211 if (alg & SSL_aRSA)
1212 pkey =
1213 X509_get_pubkey(s->session->
1214 sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1215 else {
1216 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1217 goto err;
1218 }
1219 s->session->sess_cert->peer_rsa_tmp = rsa;
1220 rsa = NULL;
1221 }
1222 #else /* OPENSSL_NO_RSA */
1223 if (0) ;
1224 #endif
1225 #ifndef OPENSSL_NO_DH
1226 else if (alg & SSL_kEDH) {
1227 if ((dh = DH_new()) == NULL) {
1228 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_DH_LIB);
1229 goto err;
1230 }
1231
1232 param_len = 2;
1233 if (param_len > n) {
1234 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT);
1235 goto f_err;
1236 }
1237 n2s(p, i);
1238
1239 if (i > n - param_len) {
1240 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_DH_P_LENGTH);
1241 goto f_err;
1242 }
1243 param_len += i;
1244
1245 if (!(dh->p = BN_bin2bn(p, i, NULL))) {
1246 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_BN_LIB);
1247 goto err;
1248 }
1249 p += i;
1250
1251 if (2 > n - param_len) {
1252 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT);
1253 goto f_err;
1254 }
1255 param_len += 2;
1256
1257 n2s(p, i);
1258
1259 if (i > n - param_len) {
1260 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_DH_G_LENGTH);
1261 goto f_err;
1262 }
1263 param_len += i;
1264
1265 if (!(dh->g = BN_bin2bn(p, i, NULL))) {
1266 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_BN_LIB);
1267 goto err;
1268 }
1269 p += i;
1270
1271 if (2 > n - param_len) {
1272 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT);
1273 goto f_err;
1274 }
1275 param_len += 2;
1276
1277 n2s(p, i);
1278
1279 if (i > n - param_len) {
1280 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_DH_PUB_KEY_LENGTH);
1281 goto f_err;
1282 }
1283 param_len += i;
1284
1285 if (!(dh->pub_key = BN_bin2bn(p, i, NULL))) {
1286 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_BN_LIB);
1287 goto err;
1288 }
1289 p += i;
1290 n -= param_len;
1291
1292 # ifndef OPENSSL_NO_RSA
1293 if (alg & SSL_aRSA)
1294 pkey =
1295 X509_get_pubkey(s->session->
1296 sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1297 # else
1298 if (0) ;
1299 # endif
1300 # ifndef OPENSSL_NO_DSA
1301 else if (alg & SSL_aDSS)
1302 pkey =
1303 X509_get_pubkey(s->session->
1304 sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].
1305 x509);
1306 # endif
1307 /* else anonymous DH, so no certificate or pkey. */
1308
1309 s->session->sess_cert->peer_dh_tmp = dh;
1310 dh = NULL;
1311 } else if ((alg & SSL_kDHr) || (alg & SSL_kDHd)) {
1312 al = SSL_AD_ILLEGAL_PARAMETER;
1313 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1314 SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER);
1315 goto f_err;
1316 }
1317 #endif /* !OPENSSL_NO_DH */
1318
1319 #ifndef OPENSSL_NO_ECDH
1320 else if (alg & SSL_kECDHE) {
1321 EC_GROUP *ngroup;
1322 const EC_GROUP *group;
1323
1324 if ((ecdh = EC_KEY_new()) == NULL) {
1325 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE);
1326 goto err;
1327 }
1328
1329 /*
1330 * Extract elliptic curve parameters and the server's ephemeral ECDH
1331 * public key. Keep accumulating lengths of various components in
1332 * param_len and make sure it never exceeds n.
1333 */
1334
1335 /*
1336 * XXX: For now we only support named (not generic) curves and the
1337 * ECParameters in this case is just three bytes. We also need one
1338 * byte for the length of the encoded point
1339 */
1340 param_len = 4;
1341 if (param_len > n) {
1342 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT);
1343 goto f_err;
1344 }
1345
1346 if ((*p != NAMED_CURVE_TYPE) ||
1347 ((curve_nid = curve_id2nid(*(p + 2))) == 0)) {
1348 al = SSL_AD_INTERNAL_ERROR;
1349 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1350 SSL_R_UNABLE_TO_FIND_ECDH_PARAMETERS);
1351 goto f_err;
1352 }
1353
1354 ngroup = EC_GROUP_new_by_curve_name(curve_nid);
1355 if (ngroup == NULL) {
1356 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_EC_LIB);
1357 goto err;
1358 }
1359 if (EC_KEY_set_group(ecdh, ngroup) == 0) {
1360 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_EC_LIB);
1361 goto err;
1362 }
1363 EC_GROUP_free(ngroup);
1364
1365 group = EC_KEY_get0_group(ecdh);
1366
1367 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1368 (EC_GROUP_get_degree(group) > 163)) {
1369 al = SSL_AD_EXPORT_RESTRICTION;
1370 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1371 SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1372 goto f_err;
1373 }
1374
1375 p += 3;
1376
1377 /* Next, get the encoded ECPoint */
1378 if (((srvr_ecpoint = EC_POINT_new(group)) == NULL) ||
1379 ((bn_ctx = BN_CTX_new()) == NULL)) {
1380 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE);
1381 goto err;
1382 }
1383
1384 encoded_pt_len = *p; /* length of encoded point */
1385 p += 1;
1386
1387 if ((encoded_pt_len > n - param_len) ||
1388 (EC_POINT_oct2point(group, srvr_ecpoint,
1389 p, encoded_pt_len, bn_ctx) == 0)) {
1390 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_ECPOINT);
1391 goto f_err;
1392 }
1393 param_len += encoded_pt_len;
1394
1395 n -= param_len;
1396 p += encoded_pt_len;
1397
1398 /*
1399 * The ECC/TLS specification does not mention the use of DSA to sign
1400 * ECParameters in the server key exchange message. We do support RSA
1401 * and ECDSA.
1402 */
1403 if (0) ;
1404 # ifndef OPENSSL_NO_RSA
1405 else if (alg & SSL_aRSA)
1406 pkey =
1407 X509_get_pubkey(s->session->
1408 sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1409 # endif
1410 # ifndef OPENSSL_NO_ECDSA
1411 else if (alg & SSL_aECDSA)
1412 pkey =
1413 X509_get_pubkey(s->session->
1414 sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
1415 # endif
1416 /* else anonymous ECDH, so no certificate or pkey. */
1417 EC_KEY_set_public_key(ecdh, srvr_ecpoint);
1418 s->session->sess_cert->peer_ecdh_tmp = ecdh;
1419 ecdh = NULL;
1420 BN_CTX_free(bn_ctx);
1421 bn_ctx = NULL;
1422 EC_POINT_free(srvr_ecpoint);
1423 srvr_ecpoint = NULL;
1424 } else if (alg & SSL_kECDH) {
1425 al = SSL_AD_UNEXPECTED_MESSAGE;
1426 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_UNEXPECTED_MESSAGE);
1427 goto f_err;
1428 }
1429 #endif /* !OPENSSL_NO_ECDH */
1430 if (alg & SSL_aFZA) {
1431 al = SSL_AD_HANDSHAKE_FAILURE;
1432 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1433 SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER);
1434 goto f_err;
1435 }
1436
1437 /* p points to the next byte, there are 'n' bytes left */
1438
1439 /* if it was signed, check the signature */
1440 if (pkey != NULL) {
1441 n2s(p, i);
1442 n -= 2;
1443 j = EVP_PKEY_size(pkey);
1444
1445 /*
1446 * Check signature length. If n is 0 then signature is empty
1447 */
1448 if ((i != n) || (n > j) || (n <= 0)) {
1449 /* wrong packet length */
1450 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_WRONG_SIGNATURE_LENGTH);
1451 goto f_err;
1452 }
1453 #ifndef OPENSSL_NO_RSA
1454 if (pkey->type == EVP_PKEY_RSA) {
1455 int num;
1456 unsigned int size;
1457
1458 j = 0;
1459 q = md_buf;
1460 for (num = 2; num > 0; num--) {
1461 EVP_MD_CTX_set_flags(&md_ctx, EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
1462 EVP_DigestInit_ex(&md_ctx, (num == 2)
1463 ? s->ctx->md5 : s->ctx->sha1, NULL);
1464 EVP_DigestUpdate(&md_ctx, &(s->s3->client_random[0]),
1465 SSL3_RANDOM_SIZE);
1466 EVP_DigestUpdate(&md_ctx, &(s->s3->server_random[0]),
1467 SSL3_RANDOM_SIZE);
1468 EVP_DigestUpdate(&md_ctx, param, param_len);
1469 EVP_DigestFinal_ex(&md_ctx, q, &size);
1470 q += size;
1471 j += size;
1472 }
1473 i = RSA_verify(NID_md5_sha1, md_buf, j, p, n, pkey->pkey.rsa);
1474 if (i < 0) {
1475 al = SSL_AD_DECRYPT_ERROR;
1476 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_RSA_DECRYPT);
1477 goto f_err;
1478 }
1479 if (i == 0) {
1480 /* bad signature */
1481 al = SSL_AD_DECRYPT_ERROR;
1482 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_SIGNATURE);
1483 goto f_err;
1484 }
1485 } else
1486 #endif
1487 #ifndef OPENSSL_NO_DSA
1488 if (pkey->type == EVP_PKEY_DSA) {
1489 /* lets do DSS */
1490 EVP_VerifyInit_ex(&md_ctx, EVP_dss1(), NULL);
1491 EVP_VerifyUpdate(&md_ctx, &(s->s3->client_random[0]),
1492 SSL3_RANDOM_SIZE);
1493 EVP_VerifyUpdate(&md_ctx, &(s->s3->server_random[0]),
1494 SSL3_RANDOM_SIZE);
1495 EVP_VerifyUpdate(&md_ctx, param, param_len);
1496 if (EVP_VerifyFinal(&md_ctx, p, (int)n, pkey) <= 0) {
1497 /* bad signature */
1498 al = SSL_AD_DECRYPT_ERROR;
1499 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_SIGNATURE);
1500 goto f_err;
1501 }
1502 } else
1503 #endif
1504 #ifndef OPENSSL_NO_ECDSA
1505 if (pkey->type == EVP_PKEY_EC) {
1506 /* let's do ECDSA */
1507 EVP_VerifyInit_ex(&md_ctx, EVP_ecdsa(), NULL);
1508 EVP_VerifyUpdate(&md_ctx, &(s->s3->client_random[0]),
1509 SSL3_RANDOM_SIZE);
1510 EVP_VerifyUpdate(&md_ctx, &(s->s3->server_random[0]),
1511 SSL3_RANDOM_SIZE);
1512 EVP_VerifyUpdate(&md_ctx, param, param_len);
1513 if (EVP_VerifyFinal(&md_ctx, p, (int)n, pkey) <= 0) {
1514 /* bad signature */
1515 al = SSL_AD_DECRYPT_ERROR;
1516 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_SIGNATURE);
1517 goto f_err;
1518 }
1519 } else
1520 #endif
1521 {
1522 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1523 goto err;
1524 }
1525 } else {
1526 /* still data left over */
1527 if (!(alg & SSL_aNULL)) {
1528 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1529 goto err;
1530 }
1531 if (n != 0) {
1532 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_EXTRA_DATA_IN_MESSAGE);
1533 goto f_err;
1534 }
1535 }
1536 EVP_PKEY_free(pkey);
1537 EVP_MD_CTX_cleanup(&md_ctx);
1538 return (1);
1539 f_err:
1540 ssl3_send_alert(s, SSL3_AL_FATAL, al);
1541 err:
1542 EVP_PKEY_free(pkey);
1543 #ifndef OPENSSL_NO_RSA
1544 if (rsa != NULL)
1545 RSA_free(rsa);
1546 #endif
1547 #ifndef OPENSSL_NO_DH
1548 if (dh != NULL)
1549 DH_free(dh);
1550 #endif
1551 #ifndef OPENSSL_NO_ECDH
1552 BN_CTX_free(bn_ctx);
1553 EC_POINT_free(srvr_ecpoint);
1554 if (ecdh != NULL)
1555 EC_KEY_free(ecdh);
1556 #endif
1557 EVP_MD_CTX_cleanup(&md_ctx);
1558 return (-1);
1559 }
1560
ssl3_get_certificate_request(SSL * s)1561 int ssl3_get_certificate_request(SSL *s)
1562 {
1563 int ok, ret = 0;
1564 unsigned long n, nc, l;
1565 unsigned int llen, ctype_num, i;
1566 X509_NAME *xn = NULL;
1567 const unsigned char *p, *q;
1568 unsigned char *d;
1569 STACK_OF(X509_NAME) *ca_sk = NULL;
1570
1571 n = s->method->ssl_get_message(s,
1572 SSL3_ST_CR_CERT_REQ_A,
1573 SSL3_ST_CR_CERT_REQ_B,
1574 -1, s->max_cert_list, &ok);
1575
1576 if (!ok)
1577 return ((int)n);
1578
1579 s->s3->tmp.cert_req = 0;
1580
1581 if (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE) {
1582 s->s3->tmp.reuse_message = 1;
1583 return (1);
1584 }
1585
1586 if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_REQUEST) {
1587 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE);
1588 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST, SSL_R_WRONG_MESSAGE_TYPE);
1589 goto err;
1590 }
1591
1592 /* TLS does not like anon-DH with client cert */
1593 if (s->version > SSL3_VERSION) {
1594 l = s->s3->tmp.new_cipher->algorithms;
1595 if (l & SSL_aNULL) {
1596 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE);
1597 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,
1598 SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER);
1599 goto err;
1600 }
1601 }
1602
1603 p = d = (unsigned char *)s->init_msg;
1604
1605 if ((ca_sk = sk_X509_NAME_new(ca_dn_cmp)) == NULL) {
1606 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST, ERR_R_MALLOC_FAILURE);
1607 goto err;
1608 }
1609
1610 /* get the certificate types */
1611 ctype_num = *(p++);
1612 if (ctype_num > SSL3_CT_NUMBER)
1613 ctype_num = SSL3_CT_NUMBER;
1614 for (i = 0; i < ctype_num; i++)
1615 s->s3->tmp.ctype[i] = p[i];
1616 p += ctype_num;
1617
1618 /* get the CA RDNs */
1619 n2s(p, llen);
1620 #if 0
1621 {
1622 FILE *out;
1623 out = fopen("/tmp/vsign.der", "w");
1624 fwrite(p, 1, llen, out);
1625 fclose(out);
1626 }
1627 #endif
1628
1629 if ((llen + ctype_num + 2 + 1) != n) {
1630 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
1631 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST, SSL_R_LENGTH_MISMATCH);
1632 goto err;
1633 }
1634
1635 for (nc = 0; nc < llen;) {
1636 if (nc + 2 > llen) {
1637 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
1638 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST, SSL_R_CA_DN_TOO_LONG);
1639 goto err;
1640 }
1641 n2s(p, l);
1642 if ((l + nc + 2) > llen) {
1643 if ((s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1644 goto cont; /* netscape bugs */
1645 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
1646 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST, SSL_R_CA_DN_TOO_LONG);
1647 goto err;
1648 }
1649
1650 q = p;
1651
1652 if ((xn = d2i_X509_NAME(NULL, &q, l)) == NULL) {
1653 /* If netscape tolerance is on, ignore errors */
1654 if (s->options & SSL_OP_NETSCAPE_CA_DN_BUG)
1655 goto cont;
1656 else {
1657 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
1658 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST, ERR_R_ASN1_LIB);
1659 goto err;
1660 }
1661 }
1662
1663 if (q != (p + l)) {
1664 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
1665 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,
1666 SSL_R_CA_DN_LENGTH_MISMATCH);
1667 goto err;
1668 }
1669 if (!sk_X509_NAME_push(ca_sk, xn)) {
1670 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST, ERR_R_MALLOC_FAILURE);
1671 goto err;
1672 }
1673
1674 p += l;
1675 nc += l + 2;
1676 }
1677
1678 if (0) {
1679 cont:
1680 ERR_clear_error();
1681 }
1682
1683 /* we should setup a certificate to return.... */
1684 s->s3->tmp.cert_req = 1;
1685 s->s3->tmp.ctype_num = ctype_num;
1686 if (s->s3->tmp.ca_names != NULL)
1687 sk_X509_NAME_pop_free(s->s3->tmp.ca_names, X509_NAME_free);
1688 s->s3->tmp.ca_names = ca_sk;
1689 ca_sk = NULL;
1690
1691 ret = 1;
1692 err:
1693 if (ca_sk != NULL)
1694 sk_X509_NAME_pop_free(ca_sk, X509_NAME_free);
1695 return (ret);
1696 }
1697
ca_dn_cmp(const X509_NAME * const * a,const X509_NAME * const * b)1698 static int ca_dn_cmp(const X509_NAME *const *a, const X509_NAME *const *b)
1699 {
1700 return (X509_NAME_cmp(*a, *b));
1701 }
1702
1703 #ifndef OPENSSL_NO_TLSEXT
ssl3_get_new_session_ticket(SSL * s)1704 int ssl3_get_new_session_ticket(SSL *s)
1705 {
1706 int ok, al, ret = 0, ticklen;
1707 long n;
1708 const unsigned char *p;
1709 unsigned char *d;
1710
1711 n = s->method->ssl_get_message(s,
1712 SSL3_ST_CR_SESSION_TICKET_A,
1713 SSL3_ST_CR_SESSION_TICKET_B,
1714 -1, 16384, &ok);
1715
1716 if (!ok)
1717 return ((int)n);
1718
1719 if (s->s3->tmp.message_type == SSL3_MT_FINISHED) {
1720 s->s3->tmp.reuse_message = 1;
1721 return (1);
1722 }
1723 if (s->s3->tmp.message_type != SSL3_MT_NEWSESSION_TICKET) {
1724 al = SSL_AD_UNEXPECTED_MESSAGE;
1725 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET, SSL_R_BAD_MESSAGE_TYPE);
1726 goto f_err;
1727 }
1728 if (n < 6) {
1729 /* need at least ticket_lifetime_hint + ticket length */
1730 al = SSL_AD_DECODE_ERROR;
1731 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET, SSL_R_LENGTH_MISMATCH);
1732 goto f_err;
1733 }
1734
1735 p = d = (unsigned char *)s->init_msg;
1736
1737 if (s->session->session_id_length > 0) {
1738 int i = s->session_ctx->session_cache_mode;
1739 SSL_SESSION *new_sess;
1740 /*
1741 * We reused an existing session, so we need to replace it with a new
1742 * one
1743 */
1744 if (i & SSL_SESS_CACHE_CLIENT) {
1745 /*
1746 * Remove the old session from the cache
1747 */
1748 if (i & SSL_SESS_CACHE_NO_INTERNAL_STORE) {
1749 if (s->session_ctx->remove_session_cb != NULL)
1750 s->session_ctx->remove_session_cb(s->session_ctx,
1751 s->session);
1752 } else {
1753 /* We carry on if this fails */
1754 SSL_CTX_remove_session(s->session_ctx, s->session);
1755 }
1756 }
1757
1758 if ((new_sess = ssl_session_dup(s->session, 0)) == 0) {
1759 al = SSL_AD_INTERNAL_ERROR;
1760 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET, ERR_R_MALLOC_FAILURE);
1761 goto f_err;
1762 }
1763
1764 SSL_SESSION_free(s->session);
1765 s->session = new_sess;
1766 }
1767
1768 n2l(p, s->session->tlsext_tick_lifetime_hint);
1769 n2s(p, ticklen);
1770 /* ticket_lifetime_hint + ticket_length + ticket */
1771 if (ticklen + 6 != n) {
1772 al = SSL_AD_DECODE_ERROR;
1773 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET, SSL_R_LENGTH_MISMATCH);
1774 goto f_err;
1775 }
1776 if (s->session->tlsext_tick) {
1777 OPENSSL_free(s->session->tlsext_tick);
1778 s->session->tlsext_ticklen = 0;
1779 }
1780 s->session->tlsext_tick = OPENSSL_malloc(ticklen);
1781 if (!s->session->tlsext_tick) {
1782 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET, ERR_R_MALLOC_FAILURE);
1783 goto err;
1784 }
1785 memcpy(s->session->tlsext_tick, p, ticklen);
1786 s->session->tlsext_ticklen = ticklen;
1787 /*
1788 * There are two ways to detect a resumed ticket sesion. One is to set an
1789 * appropriate session ID and then the server must return a match in
1790 * ServerHello. This allows the normal client session ID matching to work
1791 * and we know much earlier that the ticket has been accepted. The
1792 * other way is to set zero length session ID when the ticket is
1793 * presented and rely on the handshake to determine session resumption.
1794 * We choose the former approach because this fits in with assumptions
1795 * elsewhere in OpenSSL. The session ID is set to the SHA256 (or SHA1 is
1796 * SHA256 is disabled) hash of the ticket.
1797 */
1798 EVP_Digest(p, ticklen,
1799 s->session->session_id, &s->session->session_id_length,
1800 # ifndef OPENSSL_NO_SHA256
1801 EVP_sha256(), NULL);
1802 # else
1803 EVP_sha1(), NULL);
1804 # endif
1805 ret = 1;
1806 return (ret);
1807 f_err:
1808 ssl3_send_alert(s, SSL3_AL_FATAL, al);
1809 err:
1810 return (-1);
1811 }
1812
ssl3_get_cert_status(SSL * s)1813 int ssl3_get_cert_status(SSL *s)
1814 {
1815 int ok, al;
1816 unsigned long resplen;
1817 long n;
1818 const unsigned char *p;
1819
1820 n = s->method->ssl_get_message(s,
1821 SSL3_ST_CR_CERT_STATUS_A,
1822 SSL3_ST_CR_CERT_STATUS_B,
1823 SSL3_MT_CERTIFICATE_STATUS, 16384, &ok);
1824
1825 if (!ok)
1826 return ((int)n);
1827 if (n < 4) {
1828 /* need at least status type + length */
1829 al = SSL_AD_DECODE_ERROR;
1830 SSLerr(SSL_F_SSL3_GET_CERT_STATUS, SSL_R_LENGTH_MISMATCH);
1831 goto f_err;
1832 }
1833 p = (unsigned char *)s->init_msg;
1834 if (*p++ != TLSEXT_STATUSTYPE_ocsp) {
1835 al = SSL_AD_DECODE_ERROR;
1836 SSLerr(SSL_F_SSL3_GET_CERT_STATUS, SSL_R_UNSUPPORTED_STATUS_TYPE);
1837 goto f_err;
1838 }
1839 n2l3(p, resplen);
1840 if (resplen + 4 != (unsigned long)n) {
1841 al = SSL_AD_DECODE_ERROR;
1842 SSLerr(SSL_F_SSL3_GET_CERT_STATUS, SSL_R_LENGTH_MISMATCH);
1843 goto f_err;
1844 }
1845 if (s->tlsext_ocsp_resp)
1846 OPENSSL_free(s->tlsext_ocsp_resp);
1847 s->tlsext_ocsp_resp = BUF_memdup(p, resplen);
1848 if (!s->tlsext_ocsp_resp) {
1849 al = SSL_AD_INTERNAL_ERROR;
1850 SSLerr(SSL_F_SSL3_GET_CERT_STATUS, ERR_R_MALLOC_FAILURE);
1851 goto f_err;
1852 }
1853 s->tlsext_ocsp_resplen = resplen;
1854 if (s->ctx->tlsext_status_cb) {
1855 int ret;
1856 ret = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
1857 if (ret == 0) {
1858 al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE;
1859 SSLerr(SSL_F_SSL3_GET_CERT_STATUS, SSL_R_INVALID_STATUS_RESPONSE);
1860 goto f_err;
1861 }
1862 if (ret < 0) {
1863 al = SSL_AD_INTERNAL_ERROR;
1864 SSLerr(SSL_F_SSL3_GET_CERT_STATUS, ERR_R_MALLOC_FAILURE);
1865 goto f_err;
1866 }
1867 }
1868 return 1;
1869 f_err:
1870 ssl3_send_alert(s, SSL3_AL_FATAL, al);
1871 return (-1);
1872 }
1873 #endif
1874
ssl3_get_server_done(SSL * s)1875 int ssl3_get_server_done(SSL *s)
1876 {
1877 int ok, ret = 0;
1878 long n;
1879
1880 /* Second to last param should be very small, like 0 :-) */
1881 n = s->method->ssl_get_message(s,
1882 SSL3_ST_CR_SRVR_DONE_A,
1883 SSL3_ST_CR_SRVR_DONE_B,
1884 SSL3_MT_SERVER_DONE, 30, &ok);
1885
1886 if (!ok)
1887 return ((int)n);
1888 if (n > 0) {
1889 /* should contain no data */
1890 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
1891 SSLerr(SSL_F_SSL3_GET_SERVER_DONE, SSL_R_LENGTH_MISMATCH);
1892 return -1;
1893 }
1894 ret = 1;
1895 return (ret);
1896 }
1897
ssl3_send_client_key_exchange(SSL * s)1898 int ssl3_send_client_key_exchange(SSL *s)
1899 {
1900 unsigned char *p, *d;
1901 int n;
1902 unsigned long l;
1903 #ifndef OPENSSL_NO_RSA
1904 unsigned char *q;
1905 EVP_PKEY *pkey = NULL;
1906 #endif
1907 #ifndef OPENSSL_NO_KRB5
1908 KSSL_ERR kssl_err;
1909 #endif /* OPENSSL_NO_KRB5 */
1910 #ifndef OPENSSL_NO_ECDH
1911 EC_KEY *clnt_ecdh = NULL;
1912 const EC_POINT *srvr_ecpoint = NULL;
1913 EVP_PKEY *srvr_pub_pkey = NULL;
1914 unsigned char *encodedPoint = NULL;
1915 int encoded_pt_len = 0;
1916 BN_CTX *bn_ctx = NULL;
1917 #endif
1918
1919 if (s->state == SSL3_ST_CW_KEY_EXCH_A) {
1920 d = (unsigned char *)s->init_buf->data;
1921 p = &(d[4]);
1922
1923 l = s->s3->tmp.new_cipher->algorithms;
1924
1925 /* Fool emacs indentation */
1926 if (0) {
1927 }
1928 #ifndef OPENSSL_NO_RSA
1929 else if (l & SSL_kRSA) {
1930 RSA *rsa;
1931 unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
1932
1933 if (s->session->sess_cert == NULL) {
1934 /*
1935 * We should always have a server certificate with SSL_kRSA.
1936 */
1937 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
1938 ERR_R_INTERNAL_ERROR);
1939 goto err;
1940 }
1941
1942 if (s->session->sess_cert->peer_rsa_tmp != NULL)
1943 rsa = s->session->sess_cert->peer_rsa_tmp;
1944 else {
1945 pkey =
1946 X509_get_pubkey(s->session->
1947 sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].
1948 x509);
1949 if ((pkey == NULL) || (pkey->type != EVP_PKEY_RSA)
1950 || (pkey->pkey.rsa == NULL)) {
1951 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
1952 ERR_R_INTERNAL_ERROR);
1953 goto err;
1954 }
1955 rsa = pkey->pkey.rsa;
1956 EVP_PKEY_free(pkey);
1957 }
1958
1959 tmp_buf[0] = s->client_version >> 8;
1960 tmp_buf[1] = s->client_version & 0xff;
1961 if (RAND_bytes(&(tmp_buf[2]), sizeof tmp_buf - 2) <= 0)
1962 goto err;
1963
1964 s->session->master_key_length = sizeof tmp_buf;
1965
1966 q = p;
1967 /* Fix buf for TLS and beyond */
1968 if (s->version > SSL3_VERSION)
1969 p += 2;
1970 n = RSA_public_encrypt(sizeof tmp_buf,
1971 tmp_buf, p, rsa, RSA_PKCS1_PADDING);
1972 # ifdef PKCS1_CHECK
1973 if (s->options & SSL_OP_PKCS1_CHECK_1)
1974 p[1]++;
1975 if (s->options & SSL_OP_PKCS1_CHECK_2)
1976 tmp_buf[0] = 0x70;
1977 # endif
1978 if (n <= 0) {
1979 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
1980 SSL_R_BAD_RSA_ENCRYPT);
1981 goto err;
1982 }
1983
1984 /* Fix buf for TLS and beyond */
1985 if (s->version > SSL3_VERSION) {
1986 s2n(n, q);
1987 n += 2;
1988 }
1989
1990 s->session->master_key_length =
1991 s->method->ssl3_enc->generate_master_secret(s,
1992 s->
1993 session->master_key,
1994 tmp_buf,
1995 sizeof tmp_buf);
1996 OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
1997 }
1998 #endif
1999 #ifndef OPENSSL_NO_KRB5
2000 else if (l & SSL_kKRB5) {
2001 krb5_error_code krb5rc;
2002 KSSL_CTX *kssl_ctx = s->kssl_ctx;
2003 /* krb5_data krb5_ap_req; */
2004 krb5_data *enc_ticket;
2005 krb5_data authenticator, *authp = NULL;
2006 EVP_CIPHER_CTX ciph_ctx;
2007 EVP_CIPHER *enc = NULL;
2008 unsigned char iv[EVP_MAX_IV_LENGTH];
2009 unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
2010 unsigned char epms[SSL_MAX_MASTER_KEY_LENGTH + EVP_MAX_IV_LENGTH];
2011 int padl, outl = sizeof(epms);
2012
2013 EVP_CIPHER_CTX_init(&ciph_ctx);
2014
2015 # ifdef KSSL_DEBUG
2016 printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
2017 l, SSL_kKRB5);
2018 # endif /* KSSL_DEBUG */
2019
2020 authp = NULL;
2021 # ifdef KRB5SENDAUTH
2022 if (KRB5SENDAUTH)
2023 authp = &authenticator;
2024 # endif /* KRB5SENDAUTH */
2025
2026 krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp, &kssl_err);
2027 enc = kssl_map_enc(kssl_ctx->enctype);
2028 if (enc == NULL)
2029 goto err;
2030 # ifdef KSSL_DEBUG
2031 {
2032 printf("kssl_cget_tkt rtn %d\n", krb5rc);
2033 if (krb5rc && kssl_err.text)
2034 printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
2035 }
2036 # endif /* KSSL_DEBUG */
2037
2038 if (krb5rc) {
2039 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
2040 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, kssl_err.reason);
2041 goto err;
2042 }
2043
2044 /*-
2045 * 20010406 VRS - Earlier versions used KRB5 AP_REQ
2046 * in place of RFC 2712 KerberosWrapper, as in:
2047 *
2048 * Send ticket (copy to *p, set n = length)
2049 * n = krb5_ap_req.length;
2050 * memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
2051 * if (krb5_ap_req.data)
2052 * kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
2053 *
2054 * Now using real RFC 2712 KerberosWrapper
2055 * (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)
2056 * Note: 2712 "opaque" types are here replaced
2057 * with a 2-byte length followed by the value.
2058 * Example:
2059 * KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
2060 * Where "xx xx" = length bytes. Shown here with
2061 * optional authenticator omitted.
2062 */
2063
2064 /* KerberosWrapper.Ticket */
2065 s2n(enc_ticket->length, p);
2066 memcpy(p, enc_ticket->data, enc_ticket->length);
2067 p += enc_ticket->length;
2068 n = enc_ticket->length + 2;
2069
2070 /* KerberosWrapper.Authenticator */
2071 if (authp && authp->length) {
2072 s2n(authp->length, p);
2073 memcpy(p, authp->data, authp->length);
2074 p += authp->length;
2075 n += authp->length + 2;
2076
2077 free(authp->data);
2078 authp->data = NULL;
2079 authp->length = 0;
2080 } else {
2081 s2n(0, p); /* null authenticator length */
2082 n += 2;
2083 }
2084
2085 tmp_buf[0] = s->client_version >> 8;
2086 tmp_buf[1] = s->client_version & 0xff;
2087 if (RAND_bytes(&(tmp_buf[2]), sizeof tmp_buf - 2) <= 0)
2088 goto err;
2089
2090 /*-
2091 * 20010420 VRS. Tried it this way; failed.
2092 * EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
2093 * EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
2094 * kssl_ctx->length);
2095 * EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
2096 */
2097
2098 memset(iv, 0, sizeof iv); /* per RFC 1510 */
2099 EVP_EncryptInit_ex(&ciph_ctx, enc, NULL, kssl_ctx->key, iv);
2100 EVP_EncryptUpdate(&ciph_ctx, epms, &outl, tmp_buf,
2101 sizeof tmp_buf);
2102 EVP_EncryptFinal_ex(&ciph_ctx, &(epms[outl]), &padl);
2103 outl += padl;
2104 if (outl > sizeof epms) {
2105 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2106 ERR_R_INTERNAL_ERROR);
2107 goto err;
2108 }
2109 EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2110
2111 /* KerberosWrapper.EncryptedPreMasterSecret */
2112 s2n(outl, p);
2113 memcpy(p, epms, outl);
2114 p += outl;
2115 n += outl + 2;
2116
2117 s->session->master_key_length =
2118 s->method->ssl3_enc->generate_master_secret(s,
2119 s->
2120 session->master_key,
2121 tmp_buf,
2122 sizeof tmp_buf);
2123
2124 OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
2125 OPENSSL_cleanse(epms, outl);
2126 }
2127 #endif
2128 #ifndef OPENSSL_NO_DH
2129 else if (l & (SSL_kEDH | SSL_kDHr | SSL_kDHd)) {
2130 DH *dh_srvr, *dh_clnt;
2131
2132 if (s->session->sess_cert == NULL) {
2133 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE);
2134 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2135 SSL_R_UNEXPECTED_MESSAGE);
2136 goto err;
2137 }
2138
2139 if (s->session->sess_cert->peer_dh_tmp != NULL)
2140 dh_srvr = s->session->sess_cert->peer_dh_tmp;
2141 else {
2142 /* we get them from the cert */
2143 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
2144 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2145 SSL_R_UNABLE_TO_FIND_DH_PARAMETERS);
2146 goto err;
2147 }
2148
2149 /* generate a new random key */
2150 if ((dh_clnt = DHparams_dup(dh_srvr)) == NULL) {
2151 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_DH_LIB);
2152 goto err;
2153 }
2154 if (!DH_generate_key(dh_clnt)) {
2155 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_DH_LIB);
2156 goto err;
2157 }
2158
2159 /*
2160 * use the 'p' output buffer for the DH key, but make sure to
2161 * clear it out afterwards
2162 */
2163
2164 n = DH_compute_key(p, dh_srvr->pub_key, dh_clnt);
2165
2166 if (n <= 0) {
2167 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_DH_LIB);
2168 goto err;
2169 }
2170
2171 /* generate master key from the result */
2172 s->session->master_key_length =
2173 s->method->ssl3_enc->generate_master_secret(s,
2174 s->
2175 session->master_key,
2176 p, n);
2177 /* clean up */
2178 memset(p, 0, n);
2179
2180 /* send off the data */
2181 n = BN_num_bytes(dh_clnt->pub_key);
2182 s2n(n, p);
2183 BN_bn2bin(dh_clnt->pub_key, p);
2184 n += 2;
2185
2186 DH_free(dh_clnt);
2187
2188 /* perhaps clean things up a bit EAY EAY EAY EAY */
2189 }
2190 #endif
2191
2192 #ifndef OPENSSL_NO_ECDH
2193 else if ((l & SSL_kECDH) || (l & SSL_kECDHE)) {
2194 const EC_GROUP *srvr_group = NULL;
2195 EC_KEY *tkey;
2196 int ecdh_clnt_cert = 0;
2197 int field_size = 0;
2198
2199 if (s->session->sess_cert == NULL) {
2200 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE);
2201 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2202 SSL_R_UNEXPECTED_MESSAGE);
2203 goto err;
2204 }
2205
2206 /*
2207 * Did we send out the client's ECDH share for use in premaster
2208 * computation as part of client certificate? If so, set
2209 * ecdh_clnt_cert to 1.
2210 */
2211 if ((l & SSL_kECDH) && (s->cert != NULL)) {
2212 /*-
2213 * XXX: For now, we do not support client
2214 * authentication using ECDH certificates.
2215 * To add such support, one needs to add
2216 * code that checks for appropriate
2217 * conditions and sets ecdh_clnt_cert to 1.
2218 * For example, the cert have an ECC
2219 * key on the same curve as the server's
2220 * and the key should be authorized for
2221 * key agreement.
2222 *
2223 * One also needs to add code in ssl3_connect
2224 * to skip sending the certificate verify
2225 * message.
2226 *
2227 * if ((s->cert->key->privatekey != NULL) &&
2228 * (s->cert->key->privatekey->type ==
2229 * EVP_PKEY_EC) && ...)
2230 * ecdh_clnt_cert = 1;
2231 */
2232 }
2233
2234 if (s->session->sess_cert->peer_ecdh_tmp != NULL) {
2235 tkey = s->session->sess_cert->peer_ecdh_tmp;
2236 } else {
2237 /* Get the Server Public Key from Cert */
2238 srvr_pub_pkey =
2239 X509_get_pubkey(s->session->
2240 sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
2241 if ((srvr_pub_pkey == NULL)
2242 || (srvr_pub_pkey->type != EVP_PKEY_EC)
2243 || (srvr_pub_pkey->pkey.ec == NULL)) {
2244 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2245 ERR_R_INTERNAL_ERROR);
2246 goto err;
2247 }
2248
2249 tkey = srvr_pub_pkey->pkey.ec;
2250 }
2251
2252 srvr_group = EC_KEY_get0_group(tkey);
2253 srvr_ecpoint = EC_KEY_get0_public_key(tkey);
2254
2255 if ((srvr_group == NULL) || (srvr_ecpoint == NULL)) {
2256 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2257 ERR_R_INTERNAL_ERROR);
2258 goto err;
2259 }
2260
2261 if ((clnt_ecdh = EC_KEY_new()) == NULL) {
2262 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2263 ERR_R_MALLOC_FAILURE);
2264 goto err;
2265 }
2266
2267 if (!EC_KEY_set_group(clnt_ecdh, srvr_group)) {
2268 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_EC_LIB);
2269 goto err;
2270 }
2271 if (ecdh_clnt_cert) {
2272 /*
2273 * Reuse key info from our certificate We only need our
2274 * private key to perform the ECDH computation.
2275 */
2276 const BIGNUM *priv_key;
2277 tkey = s->cert->key->privatekey->pkey.ec;
2278 priv_key = EC_KEY_get0_private_key(tkey);
2279 if (priv_key == NULL) {
2280 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2281 ERR_R_MALLOC_FAILURE);
2282 goto err;
2283 }
2284 if (!EC_KEY_set_private_key(clnt_ecdh, priv_key)) {
2285 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_EC_LIB);
2286 goto err;
2287 }
2288 } else {
2289 /* Generate a new ECDH key pair */
2290 if (!(EC_KEY_generate_key(clnt_ecdh))) {
2291 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2292 ERR_R_ECDH_LIB);
2293 goto err;
2294 }
2295 }
2296
2297 /*
2298 * use the 'p' output buffer for the ECDH key, but make sure to
2299 * clear it out afterwards
2300 */
2301
2302 field_size = EC_GROUP_get_degree(srvr_group);
2303 if (field_size <= 0) {
2304 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB);
2305 goto err;
2306 }
2307 n = ECDH_compute_key(p, (field_size + 7) / 8, srvr_ecpoint,
2308 clnt_ecdh, NULL);
2309 if (n <= 0) {
2310 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB);
2311 goto err;
2312 }
2313
2314 /* generate master key from the result */
2315 s->session->master_key_length =
2316 s->method->ssl3_enc->generate_master_secret(s,
2317 s->
2318 session->master_key,
2319 p, n);
2320
2321 memset(p, 0, n); /* clean up */
2322
2323 if (ecdh_clnt_cert) {
2324 /* Send empty client key exch message */
2325 n = 0;
2326 } else {
2327 /*
2328 * First check the size of encoding and allocate memory
2329 * accordingly.
2330 */
2331 encoded_pt_len =
2332 EC_POINT_point2oct(srvr_group,
2333 EC_KEY_get0_public_key(clnt_ecdh),
2334 POINT_CONVERSION_UNCOMPRESSED,
2335 NULL, 0, NULL);
2336
2337 encodedPoint = (unsigned char *)
2338 OPENSSL_malloc(encoded_pt_len * sizeof(unsigned char));
2339 bn_ctx = BN_CTX_new();
2340 if ((encodedPoint == NULL) || (bn_ctx == NULL)) {
2341 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2342 ERR_R_MALLOC_FAILURE);
2343 goto err;
2344 }
2345
2346 /* Encode the public key */
2347 n = EC_POINT_point2oct(srvr_group,
2348 EC_KEY_get0_public_key(clnt_ecdh),
2349 POINT_CONVERSION_UNCOMPRESSED,
2350 encodedPoint, encoded_pt_len, bn_ctx);
2351
2352 *p = n; /* length of encoded point */
2353 /* Encoded point will be copied here */
2354 p += 1;
2355 /* copy the point */
2356 memcpy((unsigned char *)p, encodedPoint, n);
2357 /* increment n to account for length field */
2358 n += 1;
2359 }
2360
2361 /* Free allocated memory */
2362 BN_CTX_free(bn_ctx);
2363 if (encodedPoint != NULL)
2364 OPENSSL_free(encodedPoint);
2365 if (clnt_ecdh != NULL)
2366 EC_KEY_free(clnt_ecdh);
2367 EVP_PKEY_free(srvr_pub_pkey);
2368 }
2369 #endif /* !OPENSSL_NO_ECDH */
2370 else {
2371 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
2372 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
2373 goto err;
2374 }
2375
2376 *(d++) = SSL3_MT_CLIENT_KEY_EXCHANGE;
2377 l2n3(n, d);
2378
2379 s->state = SSL3_ST_CW_KEY_EXCH_B;
2380 /* number of bytes to write */
2381 s->init_num = n + 4;
2382 s->init_off = 0;
2383 }
2384
2385 /* SSL3_ST_CW_KEY_EXCH_B */
2386 return (ssl3_do_write(s, SSL3_RT_HANDSHAKE));
2387 err:
2388 #ifndef OPENSSL_NO_ECDH
2389 BN_CTX_free(bn_ctx);
2390 if (encodedPoint != NULL)
2391 OPENSSL_free(encodedPoint);
2392 if (clnt_ecdh != NULL)
2393 EC_KEY_free(clnt_ecdh);
2394 EVP_PKEY_free(srvr_pub_pkey);
2395 #endif
2396 return (-1);
2397 }
2398
ssl3_send_client_verify(SSL * s)2399 int ssl3_send_client_verify(SSL *s)
2400 {
2401 unsigned char *p, *d;
2402 unsigned char data[MD5_DIGEST_LENGTH + SHA_DIGEST_LENGTH];
2403 EVP_PKEY *pkey;
2404 #ifndef OPENSSL_NO_RSA
2405 unsigned u = 0;
2406 #endif
2407 unsigned long n;
2408 #if !defined(OPENSSL_NO_DSA) || !defined(OPENSSL_NO_ECDSA)
2409 int j;
2410 #endif
2411
2412 if (s->state == SSL3_ST_CW_CERT_VRFY_A) {
2413 d = (unsigned char *)s->init_buf->data;
2414 p = &(d[4]);
2415 pkey = s->cert->key->privatekey;
2416
2417 s->method->ssl3_enc->cert_verify_mac(s, &(s->s3->finish_dgst2),
2418 &(data[MD5_DIGEST_LENGTH]));
2419
2420 #ifndef OPENSSL_NO_RSA
2421 if (pkey->type == EVP_PKEY_RSA) {
2422 s->method->ssl3_enc->cert_verify_mac(s,
2423 &(s->s3->finish_dgst1),
2424 &(data[0]));
2425 if (RSA_sign
2426 (NID_md5_sha1, data, MD5_DIGEST_LENGTH + SHA_DIGEST_LENGTH,
2427 &(p[2]), &u, pkey->pkey.rsa) <= 0) {
2428 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY, ERR_R_RSA_LIB);
2429 goto err;
2430 }
2431 s2n(u, p);
2432 n = u + 2;
2433 } else
2434 #endif
2435 #ifndef OPENSSL_NO_DSA
2436 if (pkey->type == EVP_PKEY_DSA) {
2437 if (!DSA_sign(pkey->save_type,
2438 &(data[MD5_DIGEST_LENGTH]),
2439 SHA_DIGEST_LENGTH, &(p[2]),
2440 (unsigned int *)&j, pkey->pkey.dsa)) {
2441 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY, ERR_R_DSA_LIB);
2442 goto err;
2443 }
2444 s2n(j, p);
2445 n = j + 2;
2446 } else
2447 #endif
2448 #ifndef OPENSSL_NO_ECDSA
2449 if (pkey->type == EVP_PKEY_EC) {
2450 if (!ECDSA_sign(pkey->save_type,
2451 &(data[MD5_DIGEST_LENGTH]),
2452 SHA_DIGEST_LENGTH, &(p[2]),
2453 (unsigned int *)&j, pkey->pkey.ec)) {
2454 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY, ERR_R_ECDSA_LIB);
2455 goto err;
2456 }
2457 s2n(j, p);
2458 n = j + 2;
2459 } else
2460 #endif
2461 {
2462 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY, ERR_R_INTERNAL_ERROR);
2463 goto err;
2464 }
2465 *(d++) = SSL3_MT_CERTIFICATE_VERIFY;
2466 l2n3(n, d);
2467
2468 s->state = SSL3_ST_CW_CERT_VRFY_B;
2469 s->init_num = (int)n + 4;
2470 s->init_off = 0;
2471 }
2472 return (ssl3_do_write(s, SSL3_RT_HANDSHAKE));
2473 err:
2474 return (-1);
2475 }
2476
ssl3_send_client_certificate(SSL * s)2477 int ssl3_send_client_certificate(SSL *s)
2478 {
2479 X509 *x509 = NULL;
2480 EVP_PKEY *pkey = NULL;
2481 int i;
2482 unsigned long l;
2483
2484 if (s->state == SSL3_ST_CW_CERT_A) {
2485 if ((s->cert == NULL) ||
2486 (s->cert->key->x509 == NULL) ||
2487 (s->cert->key->privatekey == NULL))
2488 s->state = SSL3_ST_CW_CERT_B;
2489 else
2490 s->state = SSL3_ST_CW_CERT_C;
2491 }
2492
2493 /* We need to get a client cert */
2494 if (s->state == SSL3_ST_CW_CERT_B) {
2495 /*
2496 * If we get an error, we need to ssl->rwstate=SSL_X509_LOOKUP;
2497 * return(-1); We then get retied later
2498 */
2499 i = 0;
2500 i = ssl_do_client_cert_cb(s, &x509, &pkey);
2501 if (i < 0) {
2502 s->rwstate = SSL_X509_LOOKUP;
2503 return (-1);
2504 }
2505 s->rwstate = SSL_NOTHING;
2506 if ((i == 1) && (pkey != NULL) && (x509 != NULL)) {
2507 s->state = SSL3_ST_CW_CERT_B;
2508 if (!SSL_use_certificate(s, x509) || !SSL_use_PrivateKey(s, pkey))
2509 i = 0;
2510 } else if (i == 1) {
2511 i = 0;
2512 SSLerr(SSL_F_SSL3_SEND_CLIENT_CERTIFICATE,
2513 SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
2514 }
2515
2516 if (x509 != NULL)
2517 X509_free(x509);
2518 if (pkey != NULL)
2519 EVP_PKEY_free(pkey);
2520 if (i == 0) {
2521 if (s->version == SSL3_VERSION) {
2522 s->s3->tmp.cert_req = 0;
2523 ssl3_send_alert(s, SSL3_AL_WARNING, SSL_AD_NO_CERTIFICATE);
2524 return (1);
2525 } else {
2526 s->s3->tmp.cert_req = 2;
2527 }
2528 }
2529
2530 /* Ok, we have a cert */
2531 s->state = SSL3_ST_CW_CERT_C;
2532 }
2533
2534 if (s->state == SSL3_ST_CW_CERT_C) {
2535 s->state = SSL3_ST_CW_CERT_D;
2536 l = ssl3_output_cert_chain(s,
2537 (s->s3->tmp.cert_req ==
2538 2) ? NULL : s->cert->key->x509);
2539 s->init_num = (int)l;
2540 s->init_off = 0;
2541 }
2542 /* SSL3_ST_CW_CERT_D */
2543 return (ssl3_do_write(s, SSL3_RT_HANDSHAKE));
2544 }
2545
2546 #define has_bits(i,m) (((i)&(m)) == (m))
2547
ssl3_check_cert_and_algorithm(SSL * s)2548 int ssl3_check_cert_and_algorithm(SSL *s)
2549 {
2550 int i, idx;
2551 long algs;
2552 EVP_PKEY *pkey = NULL;
2553 SESS_CERT *sc;
2554 #ifndef OPENSSL_NO_RSA
2555 RSA *rsa;
2556 #endif
2557 #ifndef OPENSSL_NO_DH
2558 DH *dh;
2559 #endif
2560
2561 sc = s->session->sess_cert;
2562
2563 algs = s->s3->tmp.new_cipher->algorithms;
2564
2565 /* we don't have a certificate */
2566 if (algs & (SSL_aDH | SSL_aNULL | SSL_aKRB5))
2567 return (1);
2568
2569 if (sc == NULL) {
2570 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM, ERR_R_INTERNAL_ERROR);
2571 goto err;
2572 }
2573 #ifndef OPENSSL_NO_RSA
2574 rsa = s->session->sess_cert->peer_rsa_tmp;
2575 #endif
2576 #ifndef OPENSSL_NO_DH
2577 dh = s->session->sess_cert->peer_dh_tmp;
2578 #endif
2579
2580 /* This is the passed certificate */
2581
2582 idx = sc->peer_cert_type;
2583 #ifndef OPENSSL_NO_ECDH
2584 if (idx == SSL_PKEY_ECC) {
2585 if (check_srvr_ecc_cert_and_alg(sc->peer_pkeys[idx].x509,
2586 s->s3->tmp.new_cipher) == 0) {
2587 /* check failed */
2588 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM, SSL_R_BAD_ECC_CERT);
2589 goto f_err;
2590 } else {
2591 return 1;
2592 }
2593 }
2594 #endif
2595 pkey = X509_get_pubkey(sc->peer_pkeys[idx].x509);
2596 i = X509_certificate_type(sc->peer_pkeys[idx].x509, pkey);
2597 EVP_PKEY_free(pkey);
2598
2599 /* Check that we have a certificate if we require one */
2600 if ((algs & SSL_aRSA) && !has_bits(i, EVP_PK_RSA | EVP_PKT_SIGN)) {
2601 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,
2602 SSL_R_MISSING_RSA_SIGNING_CERT);
2603 goto f_err;
2604 }
2605 #ifndef OPENSSL_NO_DSA
2606 else if ((algs & SSL_aDSS) && !has_bits(i, EVP_PK_DSA | EVP_PKT_SIGN)) {
2607 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,
2608 SSL_R_MISSING_DSA_SIGNING_CERT);
2609 goto f_err;
2610 }
2611 #endif
2612 #ifndef OPENSSL_NO_RSA
2613 if ((algs & SSL_kRSA) &&
2614 !(has_bits(i, EVP_PK_RSA | EVP_PKT_ENC) || (rsa != NULL))) {
2615 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,
2616 SSL_R_MISSING_RSA_ENCRYPTING_CERT);
2617 goto f_err;
2618 }
2619 #endif
2620 #ifndef OPENSSL_NO_DH
2621 if ((algs & SSL_kEDH) &&
2622 !(has_bits(i, EVP_PK_DH | EVP_PKT_EXCH) || (dh != NULL))) {
2623 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM, SSL_R_MISSING_DH_KEY);
2624 goto f_err;
2625 } else if ((algs & SSL_kDHr) && !has_bits(i, EVP_PK_DH | EVP_PKS_RSA)) {
2626 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,
2627 SSL_R_MISSING_DH_RSA_CERT);
2628 goto f_err;
2629 }
2630 # ifndef OPENSSL_NO_DSA
2631 else if ((algs & SSL_kDHd) && !has_bits(i, EVP_PK_DH | EVP_PKS_DSA)) {
2632 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,
2633 SSL_R_MISSING_DH_DSA_CERT);
2634 goto f_err;
2635 }
2636 # endif
2637 #endif
2638
2639 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) && !has_bits(i, EVP_PKT_EXP)) {
2640 #ifndef OPENSSL_NO_RSA
2641 if (algs & SSL_kRSA) {
2642 if (rsa == NULL
2643 || RSA_size(rsa) * 8 >
2644 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)) {
2645 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,
2646 SSL_R_MISSING_EXPORT_TMP_RSA_KEY);
2647 goto f_err;
2648 }
2649 } else
2650 #endif
2651 #ifndef OPENSSL_NO_DH
2652 if (algs & (SSL_kEDH | SSL_kDHr | SSL_kDHd)) {
2653 if (dh == NULL
2654 || DH_size(dh) * 8 >
2655 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)) {
2656 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,
2657 SSL_R_MISSING_EXPORT_TMP_DH_KEY);
2658 goto f_err;
2659 }
2660 } else
2661 #endif
2662 {
2663 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,
2664 SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
2665 goto f_err;
2666 }
2667 }
2668 return (1);
2669 f_err:
2670 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
2671 err:
2672 return (0);
2673 }
2674
2675 #ifndef OPENSSL_NO_ECDH
2676 /* This is the complement of nid2curve_id in s3_srvr.c. */
curve_id2nid(int curve_id)2677 static int curve_id2nid(int curve_id)
2678 {
2679 /*
2680 * ECC curves from draft-ietf-tls-ecc-01.txt (Mar 15, 2001) (no changes
2681 * in draft-ietf-tls-ecc-03.txt [June 2003])
2682 */
2683 static int nid_list[26] = {
2684 0,
2685 NID_sect163k1, /* sect163k1 (1) */
2686 NID_sect163r1, /* sect163r1 (2) */
2687 NID_sect163r2, /* sect163r2 (3) */
2688 NID_sect193r1, /* sect193r1 (4) */
2689 NID_sect193r2, /* sect193r2 (5) */
2690 NID_sect233k1, /* sect233k1 (6) */
2691 NID_sect233r1, /* sect233r1 (7) */
2692 NID_sect239k1, /* sect239k1 (8) */
2693 NID_sect283k1, /* sect283k1 (9) */
2694 NID_sect283r1, /* sect283r1 (10) */
2695 NID_sect409k1, /* sect409k1 (11) */
2696 NID_sect409r1, /* sect409r1 (12) */
2697 NID_sect571k1, /* sect571k1 (13) */
2698 NID_sect571r1, /* sect571r1 (14) */
2699 NID_secp160k1, /* secp160k1 (15) */
2700 NID_secp160r1, /* secp160r1 (16) */
2701 NID_secp160r2, /* secp160r2 (17) */
2702 NID_secp192k1, /* secp192k1 (18) */
2703 NID_X9_62_prime192v1, /* secp192r1 (19) */
2704 NID_secp224k1, /* secp224k1 (20) */
2705 NID_secp224r1, /* secp224r1 (21) */
2706 NID_secp256k1, /* secp256k1 (22) */
2707 NID_X9_62_prime256v1, /* secp256r1 (23) */
2708 NID_secp384r1, /* secp384r1 (24) */
2709 NID_secp521r1 /* secp521r1 (25) */
2710 };
2711
2712 if ((curve_id < 1) || (curve_id > 25))
2713 return 0;
2714
2715 return nid_list[curve_id];
2716 }
2717 #endif
2718
2719 /*
2720 * Check to see if handshake is full or resumed. Usually this is just a case
2721 * of checking to see if a cache hit has occurred. In the case of session
2722 * tickets we have to check the next message to be sure.
2723 */
2724
2725 #ifndef OPENSSL_NO_TLSEXT
ssl3_check_finished(SSL * s)2726 int ssl3_check_finished(SSL *s)
2727 {
2728 int ok;
2729 long n;
2730 /*
2731 * If we have no ticket or session ID is non-zero length (a match of a
2732 * non-zero session length would never reach here) it cannot be a resumed
2733 * session.
2734 */
2735 if (!s->session->tlsext_tick || s->session->session_id_length)
2736 return 1;
2737 /*
2738 * this function is called when we really expect a Certificate message,
2739 * so permit appropriate message length
2740 */
2741 n = s->method->ssl_get_message(s,
2742 SSL3_ST_CR_CERT_A,
2743 SSL3_ST_CR_CERT_B,
2744 -1, s->max_cert_list, &ok);
2745 if (!ok)
2746 return ((int)n);
2747 s->s3->tmp.reuse_message = 1;
2748 if ((s->s3->tmp.message_type == SSL3_MT_FINISHED)
2749 || (s->s3->tmp.message_type == SSL3_MT_NEWSESSION_TICKET))
2750 return 2;
2751
2752 return 1;
2753 }
2754 #endif
2755
ssl_do_client_cert_cb(SSL * s,X509 ** px509,EVP_PKEY ** ppkey)2756 int ssl_do_client_cert_cb(SSL *s, X509 **px509, EVP_PKEY **ppkey)
2757 {
2758 int i = 0;
2759 #ifndef OPENSSL_NO_ENGINE
2760 if (s->ctx->client_cert_engine) {
2761 i = ENGINE_load_ssl_client_cert(s->ctx->client_cert_engine, s,
2762 SSL_get_client_CA_list(s),
2763 px509, ppkey, NULL, NULL, NULL);
2764 if (i != 0)
2765 return i;
2766 }
2767 #endif
2768 if (s->ctx->client_cert_cb)
2769 i = s->ctx->client_cert_cb(s, px509, ppkey);
2770 return i;
2771 }
2772